I am not a native English speaker. In fact, I learned English very late in life. And I don't think you have to pretend you are talking to the whole world all the time and restrict yourself to simple English.
I don't understand, there's no pretending -- On Twitter, you are effectively talking to the whole world. Anyone in the world can click on your tweets and see what you're saying. If you want to have a broad reach, then minimizing the use of complicated words and language can absolutely help. That doesn't mean you can't discuss complex things, it just means being more deliberate in the way it's discussed.
